Paper-cutting machine



(No Model.) v

H. I. KOBGEL. PAPER CUTTING MACHINE.

' No. 577,985. Patented Mar. 2, 1897.

INVENTORi Herman 1. Koegel, BY

ATTORNEY UNITED STATES PATENT FFICE'.

HERMAN I. KOEGEL, OF HOLYOKE, MASSACHUSETTS. V

PAPER-CUTTING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 577,985, dated March 2, 1897. Application filed September 21, 1894. Serial No. 523,673. (No model.)

T0 aZZ whom it may con-corn.-

Be it known that I, HERMAN I. KOEGEL, a citizen of the United States of America, and a resident of Holyoke, in the county of Hampden and State of Massachusetts, have in vented certain new and useful Improvements in Paper-Cutting Machines, of which the following is a specification.

In the rotary paper-cutting machines heretofore constructed cup-shaped cutters were used only for both cutters of each pair when both cutters were mounted on rotating shafts. The cutters used were also composed of a cast hub and flange with a separate circular steel blade or crown secured thereto. The use of cup-shaped cutters in machines with separately-mounted cutters was heretofore not practicable because eflicient cup-shaped cutters havinghub, flange, and blade integral had not been successfully produced.

Constructing cup-shaped cutters of several parts necessarily involved considerable weight of metal, with the consequence that the friction due to such weight prevented the driven cutter from propelling the loose cutter in the case of separately-mounted cutters. Furthermore, the blades or crowns of the cutters so constructed were too thick, and in consequence thereof wore away very rapidly and had frequently to'be reground and reset.

The object of my present invention is to overcome these defects, and to this end Iconstruct the cutter of one piece of cast-steel with so thin a crown that the friction due to the weight of the cutter on the shaft is so slight that a separately-mounted cutter can be readily and easily driven byits companion cutter.

The nature of my invention will best be understood when described in connection with the accompanyingdrawings, in which- Figure 1 represents a sectional elevation of a cutter constructed according to my invention. Fig. 2 is a sectional front elevation showing the cutters in operative position. Figs. 8, 4, and 5 are front elevations illustrating modified positions of the upper cutter.

Similar letters of reference designate corresponding parts.

The driven cutter, Figs. 1 and 2, I make of cast-steel, with its hub K and crown J integral, and mount the same loosely upon its shaft D. The cutter is made as light as practicable, so that the friction due to the weight of the same on the shaft is very slight, and in consequence thereof said cutter can be readily driven by its companion cutter, which in this example I have shown made in the usual way with a cast-iron hub A and flange B and an attached circular steel blade or crown O. This cutter is mounted on the rotary shaft H, as usual. Its hub is made as long as practicable, and a spring E is placed about the hub and brought to bear upon a shoulder formed thereon. A cap F receives the spring and serves also as an oil-cup. To remove the cutter rapidly from and to replace the same upon the shaft, I substitute for the usual screws a latch G, capable of being turnedin a slot at the end of the shaft. WVhen the latch is placed transversely to the shaft, the cutter J K is held in its proper position upon the shaft. WVhen the latch is turned in the direction of the length of the shaft, the cutter can be readily slipped off the former.

The great advantage of using cup-shaped cutters as separately-mounted cutters is, however, more apparent when the driven cutters are brought to occupy one of the several positions shown in Figs. 3, 4, and 5.

If the cutter J K (shown in Fig. 2) is so placed that the shafts D and H, lying in parallel planes, form an angle with each other, Fig. 3, the contact-surface and consequently also wear on the cutters are considerably reduced.

A second position I have shown in Fig. 4, where the cutter J K forms an angle with the lower cutter. In this position the cutting edges of the cutters continuously grind each other at an inward inclination and the knives always remain sharp.

In Fig. 5 I have shown the cutter J K turned from the position originally assumed in Fig. 2 laterally, so that the axes of the cutters form an angle with each other. In this case the contact surface is reduced to a minimum and the wear on the cutters is exceedingly small. The wear on the cutters is also of such a nature that the cutters are self-grinding, and they can be run for months, and, in fact, until they are used up, without being ground.

What I claim as new is- 1. In a rotary cutting-machine having separately-mounted cutters, a cup-shaped cutter provided with a hub mounted loosely upon its supporting-shaft, a cap mounted loosely on the supporting-shaft and bearing on the hub, a latch for securing the cap and cutter against longitudinal movement and a spring inclosed by the cap and acting upon the cutter, substantially as described.

2. Ina rotary cutting-machine having separately-mounted cutters, a cup-shaped cutter provided with a hub mounted loosely upon its supporting-shaft, a cap mounted loosely on the supporting-shaft and bearing on the hub, a latch pivoted to the end of the sup- 

